The entry point for adopting something already running, and the half
that was missing. The store has carried the distinction since the
beginning — a module secret records whether it was `made` or `accepted`,
and refuses to invent a replacement for the second — and
AcceptSecretForModule existed, with exactly one caller: the broker
account issued to a build machine. Nothing else could write one.
Without it every module secret is generated, which against a database
that already exists puts 32 random bytes where a working credential was.
The machine applies it, reports success, and whatever reads it fails to
authenticate somewhere else entirely, with the mesh insisting the secret
was delivered — which it was.
The value is read from a file or from standard input, never from an
argument: a value on the command line is in the shell's history and in
the process list. Same path a model-access key already takes, and no new
dependency — the first version reached for x/term and the existing one
needed nothing.
Sealed on the way in, plaintext discarded, and not printed back. The
only difference from a generated secret is where the value came from.
Two rules with a test each, and the second is the one that would have
been got wrong: only the line ending is removed, never surrounding
space. Trimming both ends is the obvious thing and would deliver a
password chosen with a leading space as a different password, silently.
Both were briefly untested for different reasons — the trimming lived
where no test could reach it, and then a -run filter matched neither
test. Extracted, and injected against the whole suite.
